p6-4.c

UNIX程序设计教程

#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include "err_exit.h"
char *env_init[]={"USER=unknow","PATH=/tmp",NULL};
int main(void)
{
        pid_t pid;
        if ((pid=vfork()) < 0)
                err_exit("vfork error");
        else if (pid==0){
                if (execle("/usr/users/zkj/echoall", "echoall",  
                                   "myarg1", "MY ARG2", (char *)0, env_init) < 0)
                        err_exit("execle error");
        }
        if ((pid=vfork()) < 0)
                err_exit("vfork error");
        else if (pid==0){
                if (execlp("echoall", "echoall", "only one arg", (char *)0)<0)
                        err_exit("execle error");
        }
        exit(EXIT_SUCCESS);
}